Collect. Czech. Chem. Commun. 1987, 52, 1115-1130

Ratio of lyate ions activities in two-components protogenic solvents

Jiří Mollina, Zdeněk Pavelekb and František Kašpáreka

a Department of Inorganic and Physical Chemistry, Palacký University, 771 46 Olomouc
b Research and Development Basis, Galena, 747 70 Opava


Kinetic method for the evaluation of lyate ions activities in two-component protogenic solvents has been discussed. Spectral methods for the measurement of equilibria between alkoxide and hydroxide ions have been compared. A correlation between dissociation constants of water and of weak organic acids in solvent mixtures has been found. By means of this correlation, ratios of lyate ions activities in water-ethanol and water-2-propanol mixtures have been calculated. These activity ratios, together with the known composition of reaction products, have been used to evaluate the selectivity of the neutral and alkaline solvolysis of phthalic anhydride and benzyl chloride in solvent mixtures quoted above.